Chevrolet Suburban 2007 Owner's Manual page 244

If the warning light comes on and a chime sounds
there could be a brake problem. Have your
brake system inspected right away.
This light may also come on due to low brake
fluid. See Brakes on page 478 for more
information.
United States
This light should come on briefly when you turn
the ignition key to RUN. If it does not come
on then, have it fixed so it will be ready to warn
you if there's a problem.
244
If the light comes on while you are driving, pull off
the road and stop carefully. You may notice
that the pedal is harder to push or may go closer
to the floor. It may take longer to stop. If the
light is still on, have the vehicle towed for service.
See Towing Your Vehicle on page 411.
Canada
CAUTION:
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Your brake system may not be working
properly if the brake system warning light
is on. Driving with the brake system
warning light on can lead to an accident.
If the light is still on after you have pulled
off the road and stopped carefully, have
the vehicle towed for service.